How can i seperate the values for R, B,G and pass the values to a equation and plot the graph?

i am getting values using

imshow strip1.tiff
vals = impixel

then i have to substitute the values of R , B , G in this equation

Ar = -log (Rs/ Rb)
Ag = -log (Gs/ Gb)
Ab = -log (Bs/ Bb)

and plot graph for RGB in one graph itself.

Answer 1

[Walter Roberson]

What are "Rs", "Gs", "Bs", "Rb", "Gb", "Bb" ?

R = vals(:,1);
G = vals(:,2);
B = vals(:,3);

[balajee J]

Thanks for u'r answer. I am new to matlab and I need to plot the graph using obtained values of R, G & B.